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plot 1*0.5*(280.14-9.81*t)**2, 1*9.81*(280.14*t-0.5*9.81*t**2) ,t=0..15
plot 1*0.5*(280.14-9.81*t)**2, 1*9.81*(280.14*t-0.5*9.81*t**2) ,t=0..15
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